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Hydroxyplumbopyrochlore, (Pb1.5,□0.5)Nb2O6(OH), a new member of the pyrochlore group from Jabal Sayid, Saudi Arabia

Published online by Cambridge University Press:  10 September 2020

Ting Li Open the ORCID record for Ting Li [Opens in a new window] ,
Ziying Li ,
Guang Fan ,
Honghai Fan ,
Jun Zhong ,
Naser S. Jahdali ,
Mingkuan Qin ,
Abdullah M. Jehani ,
Fenggang Wang  and
Mubarak M. Nahdi
Ting Li*
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Ziying Li
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Guang Fan
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Honghai Fan
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Jun Zhong
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Naser S. Jahdali
Affiliation:
Saudi Geological Survey, P. O. Box 54141, Jeddah21514, Saudi Arabia
Mingkuan Qin
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Abdullah M. Jehani
Affiliation:
Saudi Geological Survey, P. O. Box 54141, Jeddah21514, Saudi Arabia
Fenggang Wang
Affiliation:
Beijing Research Institute of Uranium Geology, CNNC, Beijing100029, China
Mubarak M. Nahdi
Affiliation:
Saudi Geological Survey, P. O. Box 54141, Jeddah21514, Saudi Arabia
*
*Author for correspondence: Ting Li, Email: [email protected]
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Abstract

A new mineral species of the pyrochlore supergroup, hydroxyplumbopyrochlore (IMA2018-145), (Pb1.5,□0.5)Nb2O6(OH), has been discovered in the Jabal Sayid peralkaline granitic complex of the Arabian Shield, Saudi Arabia. It is associated with quartz, microcline, ‘biotite’, rutile, zircon, calcite, rhodochrosite, columbite-(Fe), goethite, thorite, bastnäsite-(Ce), xenotime-(Y), samarskite-(Y), euxenite-(Y), hydropyrochlore and fluornatropyrochlore. Hydroxyplumbopyrochlore usually shows euhedral octahedra, slightly rhombic dodecahedra and cubes or their combination (0.01–0.06 mm). The mineral is pale yellow to pale brown, transparent with white streak, and has adamantine to transparent lustre. It is brittle with conchoidal fracture. No cleavage or parting are observed. It is isotropic and non-fluorescent. The average microhardness is 463.4 kg mm–2. The calculated density is 6.474 g cm–3.

Hydroxyplumbopyrochlore belongs to the cubic crystal system and exhibits the space group Fd$\bar{3}$m with unit-cell parameters a = 10.5456(6) Å, V = 1172.8(2) Å3 and Z = 8. Electron microprobe analysis gave (6-point average composition, wt.%): CaO 0.32, SrO 0.16, FeO 0.17, Ce2O3 0.07, Pr2O3 0.02, PbO 51.69, Nb2O5 40.06, SiO2 0.05, TiO2 1.68, Ta2O5 4.74, H2Ocalc 0.95, total 99.90, yielding the empirical formula (Pb1.34Ca0.03Fe0.01Sr0.01□0.61)Σ2(Nb1.75Ti0.12Ta0.12Si0.01)Σ2O6(OH0.53O0.08□0.39)Σ1, where □ = vacancy. The Raman spectrum of hydroxyplumbopyrochlore contains the characteristic bands of O–H vibrations and no bands for H2O vibrations.

Keywords

hydroxyplumbopyrochlorepyrochlore supergroupnew mineralcrystal structureSaudi Arabia
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 5 , October 2020 , pp. 785 - 790
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Daniel Atencio

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